The ZRS2M-2 has a slim profile design, allowing it for a minimal mounting Depth: 0.63"
ZX2M-2” has a deeper mounting depth: 1.20”

Both are 2in in diameter

the 2" diameter is the driver, what about the mounting flange... I have just at 2.25 to slip the drivers into, I dont mind modifying the mounting flanges but dont want to get into messing with the function of the driver itself to make it fit.

Sorry for all the questions, just trying to get a some clarity before purchasing. I looked at the website but the physical dimentions are not clear.